Bonding Bushing for Feeder (SER)

[kwired]

Metal bushings no good?

I believe they are fine unless your conductors are 4AWG or larger, then the bushing must be made of insulating material. I don't know why though.

I would love to see it too. I can only go by what I have learned by getting turned down for something the inspector says is a local requirement. I have tried to acquire some type of documentation listing all the local codes. Sadly either there is none or I have yet to find the right person to ask. I have some documentation from the mid 80's and we do sometimes get amendments sent to use but a lot of the times we find out what they are when we get turned down for something.
One example which is not very good.
An 8' ground rod is suppose to be 8' in the ground. (Don't have my code book handy so I do not know the correct wording)
In Bartlett, Arlington and Collierville which are in Shelby county, but have their own inspection offices, the ground rod must be 8' in the ground and have a clamp listed for direct burial.
In all other areas of Shelby county, the ground rod must be exposed above the ground with the clamp accessible.

If I were in your shoes I would want to know the reference for the violation. If they are going to have a law, it has to be documented someplace, and they can not charge you of violating a law they can not provide any reference to. (I would sure hope anyway)

The ground rod -

250.52(A)(5):

(5) Rod and Pipe Electrodes. Rod and pipe electrodes shall not be less than 2.44 m (8 ft) in length and shall consist of the following materials.
(a) Grounding electrodes of pipe or conduit shall not be smaller than metric designator 21 (trade size ?) and, where of steel, shall have the outer surface galvanized or otherwise metal-coated for corrosion protection.
(b) Rod-type grounding electrodes of stainless steel and copper or zinc coated steel shall be at least 15.87 mm ( in.) in diameter, unless listed.

This says that the electrode must be 8 feet long, if you have an 8 foot rod but do not bury the entire rod, then the electrode is less than 8 feet long. So if you wish to have the rod extend out of the ground then it has to be longer than 8 feet to do so. The clamp being listed for direct burial seems to be common sense if it is going to be buried.

I guess they can amend the NEC if they want, but again I would want a reference to where those amendments are published, otherwise I don't see how they can be laws if they can not produce such information.